Table 5.

Recommended algorithm for exclusion of infectious diseases in order to identify UVAL

Sexually transmitted infections	Exclusion of Treponema pallidum (dark field microscopy/serological testing) HSV Tzanck test and/or PCR (swab) In case of sexual intercourse check for gonorrhoea, chlamydia trachomatis, haemophilus ducreyi (if frequent in your country)
Other infectious conditions	Bacteria culture Microscopic analysis of fungi