Yaws are a tropical infectious disease characterized by damage to the skin and bones. Earlier in all tropical regions, especially in Equatorial Africa, in South America and in South Asia, about 50 million people fell ill every year. This disease is more common in children.


  • Papules (flat knots) on the skin, reminiscent of raspberries.
  • At a late stage of the disease - changes in the bones (especially the hands and feet), the nasal cavity and pharynx are affected.

Primary stage

The primary stage of the disease begins 2-8 weeks after infection. On the site of infection (most often on the shin), there is one or more papules that can disappear by themselves in the course of time.

Secondary stage

After 1-3 months, the second stage of the disease begins - the papules spread throughout the human body. They often appear in the vagina, anus, oral cavity. In addition, rashes on the palms and feet are characteristic. Such a rash most often is benign. Sometimes the lymph nodes greatly increase, fatigue, headaches and fever. As a result of combing due to severe itching, other skin infections often occur. Over time, the inflammation of the periosteum begins, there are changes in the bones and joints.

Tertiary stage

The tertiary stage of yaws begins about 5-20 years after infection. It is manifested by severe damage to the skin, bones and joints. For this disease, scars are characteristic, which disfigures the entire human body, and also affects the nasal cavity and pharynx.


Yaws are caused by the open in 1905, a cork-shaped mobile microorganism belonging to the species Treponema pertenue. Infection occurs by direct contact with the patient. In addition, there is a suggestion that yaws can also be transmitted through flies of the genus Hippealates. Pathogens on the skin of a sick person can only penetrate through damaged skin or mucous membranes.


Yaws are usually treated with penicillin. If the patient is allergic to this antibiotic, he is prescribed other medicines, for example, tetracycline or erythromycin.

How to help yourself? First of all, it is necessary to avoid any contact with patients. If the skin appears one or more papules that resemble raspberries, you need to urgently consult a dermatologist. The doctor will examine the affected skin, take a tissue sample and examine it under a microscope, perform a special blood test.

In the absence of treatment, this infectious pathology is constantly progressing.


Yaws are an infectious and rather dangerous disease, but it lends itself to successful treatment. With timely treatment, the patient can hope for a full recovery. In addition, with the help of modern orthopedic drugs, it is often possible to correct late complications, for example, lesions of bones and joints. At the initiative of the World Health Organization (WHO) worldwide, yaws are consistently treated with penicillin. Today, this disease is almost completely eliminated.

Differences of yaws from syphilis


  • It is distributed in almost all tropical regions.
  • The neural.
  • Children are more often ill.
  • Papules strongly itch.
  • There is no alopecia (baldness).
  • Internal organs and the central nervous system are not affected.


  • Distributed throughout the world.
  • Sometimes congenital.
  • More often adults become infected.
  • There is no itching.
  • Alopecia.
  • Internal organs and the central nervous system are often affected.


1. dysentery
2. Diphtheria in children
3. Yellow fever
4. Tick-borne encephalitis
5. K fever