The possible clinical causes of skin bumps and very itchy after going uphill include contact dermatitis, papular urticaria, and skin infections. 1. Contact dermatitis: this condition occurs when the body is exposed to allergens, such as pollen, animal hair, willow floss, etc. It often occurs in allergic people, and the clinical manifestations are generalized skin pimples, itching, erythema and so on. 2. papular urticaria: this refers to the allergic skin disease that occurs after being stung by insects, mostly seen in children and infants and young children’s groups, allergy symptoms are mainly manifested in the exposed parts, such as hands, feet, face, etc., the clinical manifestations of pimples or mounds of herpes, accompanied by itching, pain and other symptoms. 3. Skin infection: this refers to the pathogen infection caused by skin diseases, mostly occurring in the skin, mucous membrane barrier function disorders, such as decreased immunity, skin trauma, etc., the clinical manifestations of the affected areas appear pustules, blisters, swelling, oozing, etc., accompanied by itching, erythema, pain and other symptoms. The wild environment is more complex, easy to be affected by a variety of situations and skin discomfort symptoms, it is recommended to go to the hospital for targeted treatment.