The causes of a sudden red patch on the hand that is very itchy include contact dermatitis, mosquito bites, ringworm and so on, which can be treated by daily care and medication.
1. Contact dermatitis: due to skin contact with sensitizing or irritating substances, it is possible to make a sudden red spot on the hand, accompanied by itching problems.
It is recommended to actively keep away from the causative agent, clean the skin in time, and eliminate the use of hot water to stimulate the skin. Topical dexamethasone cream and mometasone furoate cream can also be used to relieve itching and eliminate inflammation. Itching is obvious, can be combined with oral loratadine, prednisone and other drugs.
2. Mosquito bites: in summer and fall, mosquitoes breed, easy to bite hands and feet and other exposed parts, and then make the hands appear erythema, itching symptoms. For this situation, usually do not need special treatment, but in order to avoid infection, do not scratch, if necessary, can be appropriate to apply cool oil to relieve itching.
3. Ringworm: when the hands are invaded by the skin fungus, also prone to erythema, itching. Usually you can apply clotrimazole, naftifine and other antifungal drugs to treat, but also with salicylic acid to exfoliate. If treatment is not effective, consider taking oral terbinafine and itraconazole to control the condition.
If the above situation occurs, it is recommended to go to the hospital in a timely manner to identify the cause, symptomatic treatment, the above drugs should be used in accordance with medical advice.