Itchy skin after scratching and bulging hard bumps are considered to be artificial urticaria, insect bite dermatitis, etc., can be used externally with glucocorticoid drugs, oral antihistamine medication. 1. Artificial urticaria: artificial urticaria is also called skin scratching, mainly in the skin after scratching the bulge or redness, you can choose loratadine, ebastine and other antihistamines to relieve the symptoms. 2. Insect bite dermatitis: this is an allergic reaction to insect bites, repeated scratching can lead to the expansion of skin lesions, can be used externally with glucocorticoid drugs such as Dinocap ointment, mometasone furoate gel and other medications, oral antihistamines such as cetirizine and other treatments. There are also many kinds of diseases can lead to itchy skin after scratching and bulging hard bumps, you should consult a doctor in a timely manner, under the guidance of the doctor’s medication, avoid indiscriminate use of drugs.