The causes of a lump under the pubic hair that is not raised include eczema, folliculitis, warts, fibroids, etc., and further differential diagnosis is needed. 1. Eczema: If it is eczema, then due to the stimulation of inflammatory factors can be triggered by the swelling of the skin, so there can be a lump not raised symptoms. 2. Folliculitis: if it is folliculitis, then due to the infection of microorganisms, resulting in the swelling of the hair follicles, can also appear lumps. 3. Warts: When the pubic area is infected by the human papilloma virus, this virus can destroy the skin tissue and lead to the occurrence of lumps. 4. Fibroids: In the case of fibroids, lumps can also occur due to the proliferation of fibrous tissue. Finally, if there is a lump under the pubic hair that is not raised, please go to the hospital for examination.