Skip to main content. Most ingrown hairs will go away on their own, but sometimes they can become infected. They don't cause symptoms and don't require treatment. This page was printed from: A large, long-term study of postmenopausal women has linked higher consumption of diet drinks to a raised risk of stroke, Lesions and bumps on penis disease, and death. Lichen planus is a rash of purple-red bumps that can develop anywhere on the body, including the penis.