There are several possibilities for acne on the hands in the summer. Generally the most common may be local infection, the most common infection may be folliculitis. 1, the occurrence of folliculitis, sometimes may be caused by bacteria, generally most mainly due to summer sweating, or local cleanliness and hygiene is less than ideal, so there is a conditional pathogenic bacteria infection, such as Staphylococcus aureus infection, so it causes inflammation of the hair follicles on the hands. 2, there may also be The patient’s hands may not sweat well, or they may be in contact with allergens, resulting in local allergic reactions, resulting in inflammatory papules, such as eczema, or contact dermatitis, resulting in papules on the basis of local erythema. 3, it is also possible that the area has a viral infection, such as herpes simplex formed by herpes virus infection, or it may be herpes zoster that appears on the The herpes that appears on the hand. So no matter which is the case, it needs to be identified and treated promptly.