An itchy buttock with big bumps upon scratching may be caused by urticaria, contact dermatitis, insect bite dermatitis and other causes.
1. Urticaria: It is a limited edema that occurs in the skin mucosa due to a temporary increase in vascular permeability. Skin scratching disease is manifested by scratching the skin after scratching with the hand, and after a few minutes there will be strips of elevation along the scratches, which will lead to itchy buttocks and big bumps when scratched.
2. Contact dermatitis: allergic reactions induced by skin contact with external sensitizers can cause itchy buttocks and big bumps when scratched.
3. insect bite dermatitis: buttocks skin by mosquito bites can also cause inflammatory reactions, causing buttocks itchy scratch big bumps phenomenon.
Itchy buttocks itchy big bumps, there may be other reasons, need to go to the hospital in time to check the cause.