| Calluses that develop on the weight-bearing portion of the forefoot and that become extremely painful may be diagnosed as intractable plantar keratosis. |
| Nail changes include pitting, transverse ridges, onycholysis, keratosis, yellowing, and destruction. |
| Treatment limiting the appearance of ingrowing hair or keratosis pilaris. |
| Retin-A is the acid form of vitamin A commonly applied to treat acne vulgaris and keratosis pilaris. |
| Actinic keratosis lesions usually measure less than one-quarter inch in diameter and more than 80 per cent of lesions occur on the upper limbs, head and neck. |
| The development of actinic keratosis or malignant melanomas are among the possible serious consequences. |
