3. Allergic Contact Dermatitis
An allergic reaction can develop after exposure to:
- Laundry detergent
- Soap
- Lotion
- New clothing
- Plants
- Metals
Symptoms often include:
- Itchy raised bumps
- Redness
- Swelling
- Rash that develops where the skin touched the irritant
4. Insect Bites
Mosquitoes, fleas, bed bugs, and other insects commonly cause clusters of itchy bumps.
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You may notice:
- One or several raised bumps
- Redness
- Swelling
- Intense itching
5. Eczema
Eczema can appear almost anywhere on the body, including behind or around the knees.
Common symptoms include:
- Dry patches
- Redness
- Itching
- Small raised bumps
- Cracked skin
6. Hives (Urticaria)
Hives are raised welts caused by an allergic reaction, infection, medication, or sometimes no obvious trigger.