Yes, it is possible to have an allergic reaction to shampoo.
Many shampoos contain an ingredient that some people are sensitive to. An allergic reaction occurs when an allergen enters the body and the immune system begins to fight it in order to protect itself.
To neutralize an allergic reaction, rinse your head thoroughly with water, especially the irritated area of the scalp - do not use the shampoo that caused the irritation. If the reaction is manifested by severe symptoms, consult a doctor immediately.
You have an allergy to shampoo if you have the following symptoms:
- Redness and irritation of the scalp or neck;
- Itching or burning sensation;
- The irritated area is swollen;
- A kind of scaly rash or pimples on the skin;
- Dryness or peeling of the scalp;
- Increased sensitivity to the sun.
Seek immediate medical attention if you experience the following symptoms:
- Severe skin irritation;
- Rash spreads to other areas of the body;
- No improvement despite home treatment;
- Signs of infection.
Call emergency medical services if you experience the following symptoms:
- Difficulty breathing;
- Feeling as if your throat is closed;
- Difficulty speaking;
- Coughing;
- Nausea, abdominal pain, diarrhea, vomiting;
- Difficulty swallowing or drooling;
- Low blood pressure;
- Feeling of a pounding heart.
Source:
https://www.verywellhealth.com/allergic-reaction-shampoo-5216076
