Potassium citrate and cranberry juice,What is the most likely diagnosis?

A 28-year-old woman has noticed this blistering eruption appear over her body every 2-3 months for the last year (see image).
On each occasion she has had symptoms of genital soreness and has taken some Potassium citrate and cranberry juice.
What is the most likely diagnosis?


  1. Fixed drug eruption
  2. Erythema multiforme
  3. Disseminated gonoccacal disease
  4. Bullous phemphigus
  5. Urticaria.