The most common side effect after leech treatment is an allergic reaction. This can be in the form of swelling, redness, extreme itching, and even blushing. It is not an alarming condition. The therapy should be interrupted for some while. We also recommend the use of ice, the use of allergy tablets and the consultation with the doctor in charge.
By using leeches, the reasons for an infection may be that the leeches were not purchased from a trusted source and/or the application environment / material condition was not hygienic. There are no other known adverse effects of leech application if the person who will receive the leech therapy is applied is classified by the physician as appropriate for the therapy.