Whenever you get pimples in summer, it could be prickly heat, acne, etc. Consider that it is related to poor hygiene, dietary factors, and psycho-immune factors. 1. Prickly heat: If you get pimples in the summer, it may not be true acne, but it is related to prickly heat. If you are often in a hot and humid environment, sweat will not be discharged properly and will collect in the sweat ducts, resulting in prickly heat, which mainly occurs in the hot summer months. 2. Acne: Acne can also be considered as a cause of pimples in summer. If you often eat spicy, stimulating, greasy food in summer, it may increase the secretion of sebaceous glands and lead to acne. Usually do not pay attention to cleanliness and hygiene, bangs are longer, covering the part of poor ventilation and air permeability, may also lead to localized acne. Often overtime and late at night, long-term sleep deprivation leads to immunity decline, may also lead to forehead acne. It is recommended to pay attention to life and dietary adjustments, if the acne situation further aggravated, but also to the hospital dermatology department for diagnosis and treatment.