What should I do if I have an itchy red rash on my back that gets worse the more I scratch it?

An itchy red rash on the back that gets worse the more you scratch it is considered to be related to eczema, papular urticaria, folliculitis and other factors. General treatment and medication can be given to relieve the symptoms.
1. Eczema: The causes of eczema are complex, and may appear as erythematous spots, papules and pimples, accompanied by obvious itching sensation. It is recommended to find and remove the causative factors, give glucocorticoid drugs, such as dieldrin cream, mometasone furoate cream, hydrocortisone acid cream or oral loratadine and other antihistamines, which have anti-inflammatory, antipruritic, and disease-control effects.
2. Papular urticaria: consider mosquito bites. It is recommended to detach from the environment, avoid scratching and stimulation, and induce bacterial infection. If necessary, oral levocetirizine hydrochloride, diclofenac tadalafil, olopatadine hydrochloride and other drugs can help relieve itching.
3. Folliculitis: If the folliculitis is caused by bacterial infection, it can be given fusidic acid cream, mupirocin ointment, with oral roxithromycin, amoxicillin and other drugs. If the folliculitis is caused by fungal infection, ketoconazole lotion, miconazole cream, itraconazole and other antifungal drugs can be given.
If the back of the red rash with obvious itching, the more you scratch the more, it is recommended not to scratch the stimulus, timely to the hospital dermatology consultation, to clarify the cause, under the guidance of the doctor standardized treatment. The above drugs should be used in accordance with medical advice, do not self-medication.