Injection Site Reactions With TRT: What the Labels Report

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Key numbers

• 26%Erythema (redness) at the injection site in Azmiro-treated men in the single-dose studySource: dailymed.nlm.nih.gov, as cited 2026-11-08
• 4%Injection-site reaction in Azmiro-treated men in the single-dose study, all cases mildSource: dailymed.nlm.nih.gov, as cited 2026-11-08
• 6.7%Injection-site bruising in men in the Xyosted open-label studySource: dailymed.nlm.nih.gov, as cited 2026-11-08
• 200 mgSingle Azmiro intramuscular dose given in the single-dose study of men with hypogonadismSource: dailymed.nlm.nih.gov, as cited 2026-11-08

At a glance

• Azmiro study / erythema 26%, injection-site reaction 4%, all mild [2]
• Xyosted study / bruising 6.7% in 150 men over 1 year [3]
• Depo-Testosterone label / lists injection-site pain and inflammation, no rate [1]
• Azmiro route / deep gluteal intramuscular only; prefilled syringe by a healthcare professional [2]
• Depo-Testosterone route / deep gluteal intramuscular only; never intravenous [1]
• Xyosted route / subcutaneous in the abdomen only, once weekly [3]
• Hypersensitivity / skin manifestations and anaphylactoid reactions reported [1][2]
• VTE warning / evaluate leg pain, swelling, warmth and redness, or sudden shortness of breath [1]

What the labels report

The Depo-Testosterone label lists inflammation and pain at the site of intramuscular injection among adverse reactions, without a rate [1]. The Azmiro label lists injection-site erythema and injection-site reaction as common adverse reactions with an incidence of 4% or more [2]. The Azmiro single-dose study enrolled 27 men with hypogonadism. They received a single 200 mg intramuscular dose of Azmiro and were observed for 31 days. Among Azmiro-treated patients, erythema occurred in 26% and injection-site reaction in 4%. All cases were mild, defined as slight or barely perceptible [2].

The Xyosted 1-year open-label study enrolled 150 men and had no placebo arm; injection-site bruising occurred in 6.7% [3]. In the same study, hematocrit increase occurred in 14.0% and hypertension in 12.7% [3]. The Azmiro and Xyosted rates come from separate studies; the Azmiro label notes that adverse reaction rates from different trials cannot be directly compared [2].

What people on Reddit report

Men on testosterone injections describing itching, redness or bumps at the injection site, and whether they think an oil allergy, technique or other cause is responsible.

shiny_metal · ftm

Not a doctor but I don't think it's supposed to itch, you might want to talk to your provider about that. From what I understand some people are allergic to the oil that the T is in and that can cause itching.

Believes itching is not expected and that an allergy to the carrier oil can cause it.

Read the source discussion

shus-and-felt · ftm

I actually had to switch from Cypionate to Enanthate because I was allergic to the oil base. Like ITCHY red bump at the injection site that got worse every week.

Switched testosterone esters after an itchy, worsening red bump that they attributed to the oil base.

Read the source discussion

avalanchefan95 · ftm

Being allergic to the oil from the T isn't very common actually. But injecting difficulties are common so if you're going to do your injection tomorrow anyway, try this and see if it clears it up.

Argues that injection technique, not oil allergy, is the more common cause and suggests changing the angle first.

Read the source discussion

Throwaway-R6 · ftm

Do you do subq or IM? If it's subq then the only time mine itches is when I don't inject it far enough into the fat layer. Adjusting the angle might help solve that issue.

Reports itching only when the injection is not deep enough into fat and suggests adjusting the angle.

Read the source discussion

Questions worth asking

Choose the questions you want to keep

Could this redness or itching be an allergy to the oil in my testosterone?Is it normal for my injection site to stay itchy for several days?Should I change my injection angle or depth to reduce site reactions?Which injection route does my testosterone product use?What signs of infection or a blood clot should prompt a call to my doctor?Could switching between cypionate and enanthate help with site reactions?

Copy questions

Ingredients and hypersensitivity

Cypionate and enanthate are oil-soluble testosterone esters that are absorbed slowly from the oil depot after injection [1]. Depo-Testosterone contains cottonseed oil, benzyl benzoate and a benzyl alcohol preservative [1]. The Xyosted label's hypersensitivity contraindication names sesame oil [3]. The Azmiro label contraindicates known hypersensitivity to Azmiro or any of its components [2].

Route instructions differ by product

Depo-Testosterone is for deep gluteal intramuscular use only and should not be given intravenously [1]. Azmiro is also deep gluteal intramuscular only; its prefilled syringe is given by a healthcare professional and is used only for 200 mg doses [2]. Xyosted is subcutaneous in the abdomen only, once weekly [3]. Injectable testosterone products may have different administration instructions and are not substitutable milligram for milligram [2].

Reactions beyond local irritation

The labels report hypersensitivity, including skin manifestations and anaphylactoid reactions [1][2]. The Depo-Testosterone label also lists venous thromboembolism. It says to evaluate patients with pain, edema, warmth and erythema in the lower extremity for deep vein thrombosis, and patients with acute shortness of breath for pulmonary embolism. It says to discontinue treatment if a venous thromboembolic event is suspected [1].

Frequently asked questions

›What injection-site reactions are reported with testosterone?

The Depo-Testosterone label lists injection-site pain and inflammation [1]. The Azmiro study reported erythema in 26% and injection-site reaction in 4%, all mild [2]. The Xyosted study reported bruising in 6.7% [3].

›Which TRT products use which injection route?

Depo-Testosterone and Azmiro are given by deep gluteal intramuscular injection [1][2]. Xyosted is injected subcutaneously in the abdomen once weekly [3].

›When is a reaction more than local irritation?

The labels report hypersensitivity, including skin manifestations and anaphylactoid reactions [1][2]. The Depo-Testosterone label says to evaluate leg pain, swelling, warmth and redness for deep vein thrombosis and acute shortness of breath for pulmonary embolism [1].

›What did the Azmiro study measure?

The Azmiro study was a single-dose study that enrolled 27 men with hypogonadism. They received a single 200 mg intramuscular dose of Azmiro and were observed for 31 days [2].

›What did the Xyosted study report?

The Xyosted 1-year open-label study enrolled 150 men and had no placebo arm. Injection-site bruising occurred in 6.7%, hematocrit increase in 14.0%, and hypertension in 12.7% [3].

What people actually ask

What are the possible causes of a rash at the testosterone injection site?

No specific cause of a rash is named. Labels report injection-site erythema (redness) in 26% of Azmiro-treated men in one single-dose study, all mild, and list skin manifestations under hypersensitivity. Depo-Testosterone contains cottonseed oil, benzyl benzoate and a benzyl alcohol preservative, and the Xyosted label's hypersensitivity contraindication names sesame oil.

When to worry about an injection site reaction?

Worry most about symptoms that go beyond local irritation. The Depo-Testosterone label says to evaluate leg pain, swelling, warmth and redness for deep vein thrombosis, and acute shortness of breath for pulmonary embolism, and to discontinue treatment if a venous thromboembolic event is suspected. The labels also report hypersensitivity, including skin manifestations and anaphylactoid reactions.

What are the signs of a bad testosterone injection?

Injection-site pain, redness and bruising are the local reactions listed. Depo-Testosterone lists injection-site pain and inflammation without a rate, erythema occurred in 26% and injection-site reaction in 4% of Azmiro-treated men, and bruising occurred in 6.7% of men in the Xyosted study. Signs of a poorly placed injection are not described.

References

1. U.S. National Library of Medicine, DailyMed. Depo-Testosterone (cypionate) intramuscular, Pharmacia & Upjohn/Pfizer (testosterone cypionate) prescribing information. Depo-Testosterone (cypionate) intramuscular, Pharmacia & Upjohn/Pfizer (testosterone cypionate) label
2. U.S. National Library of Medicine, DailyMed. Azmiro (cypionate) intramuscular, Azurity (testosterone cypionate) prescribing information. Azmiro (cypionate) intramuscular, Azurity (testosterone cypionate) label
3. U.S. National Library of Medicine, DailyMed. Xyosted (enanthate) subcutaneous autoinjector, Antares (testosterone enanthate) prescribing information. Xyosted (enanthate) subcutaneous autoinjector, Antares (testosterone enanthate) label
4. Reddit participants. The trans urge to scratch the f*cking injection site because it ITCHES (r/ftm). Accessed 2026-11-11.
5. Reddit participants. Sub Q Injection Reaction?? Anyone have this/help? (r/ftm). Accessed 2026-11-11.