A visual guide to recognizing what's normal, what needs attention, and what's an emergency. For Source of Health patients on injectable hormone therapy or peptides.
The reality of injection site reactions
Most injection site reactions are histamine-mediated — your immune system reacting to the oil carrier, a trace component, or the needle's mechanical insult. They itch, they look angry, and they almost always resolve on their own. The threshold for alarm is systemic symptoms or tissue breakdown — not the presence of a welt.
This guide gives you a clear framework: green means manage at home, amber means call us, and red means seek care now. When in doubt, call.
01
The Three Levels
Green — Manage at Home
Annoying. Not alarming.
Itch only — no heat, no pain
Hives local to the injection zone
Onset 30 minutes to a few hours after
Resolves in 24–48 hours
Same as prior injections
Action: Cold compress · oral antihistamine (loratadine or cetirizine) · rotate injection sites · adjust technique if needed.
Amber — Call Your Provider
Escalating. Needs a look.
Worse with each dose
Timing shifted — faster onset
Spreading beyond injection zone
Lasting more than 48–72 hours
Started with a new vial or lot
Itch now joined by mild warmth
Action: Pause the protocol · contact SOH for formulation review · possible oil or carrier switch · possible pre-treatment with antihistamine.
Red — Seek Care Now
This is not a histamine story.
Heat and pain at injection site
Redness spreading more than 5 cm
Fever, chills, or flu-like symptoms
Pus, abscess, or skin breakdown
Wheezing or throat tightening
Dizziness or sense of impending doom
Tender lymph nodes near the site
Action: Wheezing / throat / dizziness = 911. Heat + pain + fever = urgent care or ED. Do not wait. Do not just take more antihistamine.
02
The Antihistamine Test
The single best at-home diagnostic for figuring out what kind of reaction you're having. It's quick, it's cheap, and it tells you whether to relax or escalate.
Diagnostic Tool
The Antihistamine Diagnostic Test
Protocol: Take a standard dose of loratadine (Claritin) or cetirizine (Zyrtec) when the reaction begins. Wait 60–90 minutes. Then read the result below.
✓ Significantly Better
Confirms a histamine-mediated response. This is a formulation or technique issue — not an infection. It can be managed. Document and let us know at your next visit, or sooner if it keeps happening.
✗ No Improvement
Something else is happening. Heat, pain, or fever suggests possible infection or cellulitis. Contact your Source of Health provider today. Do not just add more antihistamine.
03
When to Call Source of Health
Reach out when
Any of these are true — call us
Reactions are getting worse with each injection cycle.
You've changed formulations and the reactions are still happening.
The timing pattern has shifted — reactions are starting faster.
Heat, pain, or fever has joined the reaction.
Systemic symptoms: dizziness, throat changes, shortness of breath.
You're not sure. Call. That's what we're here for.
04
The Clinical Bottom Line
What we want you to remember
A hive that itches and fades within 24 hours is your immune system doing exactly what it's designed to do — reacting, flagging, and resolving. It looks dramatic but it is not dangerous.
The line to watch is systemic involvement — symptoms that go beyond the injection site. Fever, spreading redness, breathing changes, dizziness. Those are the signals that something needs more than an antihistamine.
Reserve your urgency for the right moments. And reach out before you panic — we'd rather hear from you about a green-level concern than have you sit with a red-level one. That's the whole point of being your provider.