Used in phototherapy for skin disorders such as psoriasis and vitiligo. Enhances the skin's sensitivity to ultraviolet light, allowing lower UV doses to achieve therapeutic effects. Commonly applied in combination with UVA light (PUVA therapy) to slow down rapid skin cell growth and repigment affected areas. Also investigated for its potential in treating certain types of cutaneous T-cell lymphoma. Its natural occurrence in plants like figs and celery makes it relevant in studying photosensitizing compounds in dermatology and phytophotodermatitis.