Folliculitis is asymptomatic and causes mild itching or tenderness. Although the follicular red papules and pustules can be found wherever there are hair follicles, the lesions are most often seen under the beard or on the neck, chest, back, buttocks, and thighs (Fig. 47-1). Occasionally, the inflammation is severe enough to create crusting and pain. This condition is an infection of the hair follicles. Staphylococcus aureus is the most common culprit. Pseudomonas aeruginosa is responsible for hot tub dermatitis. In this condition, the follicular lesions are predominantly on the trunk and buttocks.