1. Finsen used short wavelength light to treat lupus vulgaris, a skin infection caused by Mycobacterium tuberculosis.

2. Lupus vulgaris, atypic mycobacteriosis, lepra, actinomycosis, cutaneous leishmaniosis and erysipelas belong to the nodular and diffuse dermatoses.

3. The 1903 Nobel Prize for Medicine was awarded to Niels Finsen for his use of UV against lupus vulgaris, tuberculosis of the skin.