The skin on the forehead and the nose and chin area form the T zone of the face, this is usually the most oily part of the face due to the presence of many large oil glands. So especially in summer due to the increased sweating there is likely to be more acne formation. Please use a ph balanced salicylic acid face wash twice a day for a month. Also eat healthy and avoid junk food. Avoid popping the acne as it may lead to scars. Avoid dairy products and sugary foods.
If not better you may need oral antibiotics as well as retinoids creams to help. Please contact a dermatologist who can examine you and prescribe the appropriate skin care products and treatments