A doctor should watch the treatment. The pathogenes of the leishmaniosis, a local skin infection, is Leishmania Tropica. It gets transfered to humans by the sand fly. The desease produces knots and abscesses on the skin. It can be proved by skin tests.
Treatment is difficult and needs a long time.
In most cases, the desease even heals without treatment within one year by leaving scarrs. One of my friends brought this illness as a souvenier from Costa Rica. Several doctors in Germany could not identify the desease. Only with the help of the tropical institute, the right diagnosis was done and the illness could be healed withinn 2 weeks. However, the tropical institute said that catching this illness during a vacation was like winning some millions in the lottery, so panic is absolutely unnecessary.