Nodular acne is a severe form of acne characterized by large, painful lumps beneath the skin's surface. These nodules are often firm and can be red or inflamed. Unlike typical pimples, nodular acne does not have a visible head and can take longer to heal, often leading to scarring if not treated properly. This type of acne is commonly associated with hormonal changes, stress, and certain medications. Treatment options include topical retinoids, antibiotics, and in some cases, isotretinoin, a powerful medication that targets severe acne. Consulting a dermatologist is essential for effective management.