If you have hard nodules on your penis after squeezing a pimple, consider that it is related to folliculitis, sebaceous adenitis, boils and other diseases. 1. Folliculitis: usually due to the hair follicle mouth blockage, hair follicle oil secretion and other factors lead to the accumulation of follicle oil, caused by the production of acne, and then appeared after the penis after squeezing pimples and hard knots phenomenon, folliculitis usually appear red and swollen and other symptoms. 2. Sebaceous adenitis: generally due to the sebaceous glands under the stimulation of bacterial infection, so that its oil secretion, skin resistance to decline, will appear on the skin surface of the phenomenon of pimples, thus appearing after the penis after squeezing pimples and hard nodules of the phenomenon, and will appear red, swollen, pain and other symptoms. 3. Boils: may be due to bacterial infection, drinking and other factors, stimulation of the skin around the penis, the occurrence of pimples, which in turn caused the phenomenon of hard knots after the penis after squeezing the pimples, boils usually appear pain and other symptoms. If there is the phenomenon of hard knots after squeezing pimples on the penis, you can go to the hospital in time to avoid delaying the condition and adverse consequences.