vitiligo

Khellin (Methafrone) is a vasodilator that also has bronchodilatory action.

Monobenzone (Benoquin) is a Depigmenting Agent. The mechanism of action of monobenzone is as a Melanin Synthesis Inhibitor. The physiologic effect of monobenzone is by means of Depigmenting Activity.

5-Hydroxy-8-methoxypsoralen (5-Hydroxyxanthotoxin) is a potent tricyclic furocoumarin suicide inhibitor of CYP (cytochrome P-450) and a metabolite of Xanthotoxin. It is used in the treatment of psoriasis, eczema, vitiligo, and certain cutaneous lymphomas in combination with phototherapy involving exposure to sunlight.

Trioxsalen (Trioxysalen) is a furanocoumarin and a psoralen derivative, in conjunction with UV-A for phototherapy treatment of vitiligo and hand eczema. After photoactivation it creates interstrand cross-links in DNA, which can cause programmed cell death.