Illicit subcutaneous injections of massive quantities of highly viscous fluids are still performed, often by unqualified persons. Fifteen male-to-male transsexuals consulted the authors regarding their devastating long-term outcomes after the injection of up to 8 liters of alleged silicone or mineral oil to feminize their bodies. After a latency period of up to 17 years, these injections led to complications ranging from scarring and deformity to infections. These patients were treated conservatively for inflammation and infection or surgically by resection of the oil-infested areas. In view of the potential dangers, feminization by the injection of high-viscosity fluids should be soundly condemned.
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