Dear Melissa, Welcome to HCM These pimples are caused from two main problems : 1. Folliculitis. This is the inflammation of a hair follicle, which can occur anywhere on your body. It doesn’t have to be from an ingrown hair. Instead it can be caused by friction from clothing that is too tight or a bacterial infection. Folliculitis tends to be on the skin surface. These are very shallow little pus bumps and folliculitis is more likely to be itchy or irritating than painful. 2. Carbuncles. Also known as boils, these feel more like painful knots of pus under the skin, something like an acne cyst. They can occur when folliculitis gets out of control and starts to become a deeper infection. In this case, in my opinion I think that she has folliculitis. I advise her to take these precautions: 1. Wear loose clothing whenever possible — tight clothing can cause skin irritation that leads to folliculitis. 2. She has to wash her buttocks at least once daily in a hot shower. Heat and moisture encourage her pores to open up and clear out, so this step is particularly valuable if she has pustules that seem ready to burst. She has to soap up a washcloth to combine gentle exfoliation with cleaning; exfoliating her skin also opens up the pores and helps to both clear up any acne that s already present and prevent future breakouts. She has to use a loofah sponge for more heavy-duty exfoliation if needed, but take care not to irritate the skin. She has to choose an antibacterial soap if her skin can tolerate it, or a mild castile soap if her skin is sensitive. 3. She has to sit on a hot towel for 20 minutes. Repeat three to four times a day. Like a hot shower, the heat of the towel encourages the pores to open up and can also help cysts and boils to rise to the surface of her skin and begin to drain. 4. She has to apply benzoyl-peroxide ointment to her buttocks once a day. It s best if she applies a thin film to the entire area rather than just to problem spots. Benzoyl peroxide is a strong anti-acne treatment with an antibacterial action; its main side effect is that it can dry out skin. If benzoyl peroxide is too strong, she can try a product that contains salicylic acid. The best time to perform this step is just before bedtime. Regular application should clear up any acne within five to seven days. Folliculitis, must be under control to avoid carbuncles and the need for more aggressive treatment. So, If these folliculitis persist, you may want to take an antibiotic treatment. I also advise her to see a dermatologist to determine a correct diagnosis. hope this helps her Dr. Ermira BIU