Medically reviewed by William Truswell, MD Different types of pimples can have various appearances, causes, and treatments.

Trichomycosis may also present with follicular pustules, nodules, and hair loss. It should always be excluded before the beginning of treatment. Culture of hair material (pulling out an affected ...

Papules are usually surrounded by an erythematous halo, while pustules contain purulent material and are less than 5 mm in size. Nodules are rounder, deeper, and more tender than papules.