The redness and itchiness of the outer auricle of the ear may be contact dermatitis, ringworm, insect bite dermatitis, eczema, medicinal rashes and so on.
1. contact dermatitis: auricle contact with external allergy-inducing substances or irritating substances, resulting in a metamorphic reaction, can cause redness and itchiness of the outer auricle of the ear, and some will be accompanied by skin rashes.
2. Ringworm: fungal infection caused by the skin ringworm, may also lead to redness and itching of the outer auricle of the ear, and most of them will be accompanied by erythema and flaking.
3. Insect bite dermatitis: localized skin by mosquito bites can also cause an inflammatory reaction, resulting in redness and itching on the outside of the ear.
4. Eczema: Inflammatory reaction caused by internal and external stimuli may also lead to redness and itching of the outer ear, accompanied by blisters, papules and obvious oozing tendency in the acute stage.
5. Drug rash: drug allergic reaction caused by the use of drugs, may also be manifested in the redness and itching of the outer ear auricle symptoms, and will be accompanied by rashes and itching in other parts of the body.
The redness and itchiness of the outer auricle of the ear may have other causes, you should go to the hospital in time to check, clarify the cause of the disease, and actively treat it.