<s>[INST] big, red, swollen bug bites. they are hard to the touch and getting bigger, my son is 4 years old and he was playing in the durt and mud in the garden, he had a few little bites looked like mosqutos bites and in the morning he is covered by this huge and very itchy red lumps, what is it?? [/INST] Most likely it is due to allergic reaction to bug bites. It happens due to release of histamines and other inflammatory mediators body due to insect bites. Don't worry. You may give him antihistamine such as Chlorpheniramine or fexofenadine for relief. Apply lactocalamine lotion on the lesions for early recovery. In case he develops any breathing difficulty, then visit an ER for emergency treatment. He may require steroids and a Chat Doctor. Hopefully this will help you. Take care </s>