May cause photosensitivity. Risk may be increased by concurrent therapy with known photosensitizers (thiazides, tetracyclines, fluoroquinolones, phenothiazines, sulfonamides). Treatment can increase skin sensitivity to weather extremes of wind or cold. Also, concomitant topical medications (e.g. medicated or abrasive soaps, cleansers, or cosmetics with a strong drying effect) should be used with caution due to increased skin irritation. Potential teratogenicity. For external use only. Not for use on eczematous, broken, or sunburned skin. Not for treatment of lentigo maligna.