Red dots on the calves, the more you scratch the more itchy, can be seen in insect bite dermatitis, primary skin amyloidosis or atopic dermatitis and other diseases.
1. Insect bite dermatitis: in mosquitoes, midges, fleas and other insect bites or venomous sap stimulation, can be seen in the bite at the bite of the pinpoint size of the bite mark, conscious itching, can make the skin petechiae, doughnuts or pimples and other lesions, scratching, due to the inflammatory reaction aggravate the lesions, itching aggravated.
2. Primary cutaneous amyloidosis: it refers to amyloid deposition in normal skin, which can be related to heredity, long-term friction, viruses or environmental factors, etc. Its type of amyloidosis moss can appear in the calf of light red, yellow, brown and other traits of the rash, accompanied by itchy or itchy, after scratching for a long time, it can lead to the manifestation of mossification.
3. Atopic dermatitis: related to genetic, immune and environmental factors, erythema, pinpoint-sized papules or papules appear in the limbs and other parts of the body, with itching, after scratching, friction can cause localized vesicles or oozing.
Overall, people scratch because they feel itchy, followed by pain from scratching; and then, the body releases serotonin to control pain due to the emergence of pain signals, but these serotonin inhibit pain at the same time, incidentally activate the neurons in the spinal cord that convey itchy signals, so that itchy sensation is even stronger, and intense itchy sensation triggers a new round of scratching and pain, and enters into the scratching-itching cycle.
If the itchy rash on the legs does not go away on its own or recurs, it is recommended to consult a doctor and follow the doctor’s instructions to standardize the use of medication.