Small painless lump under the skin of the side penile shaft, doesn't seem to move and is more noticeable when erect, it can be felt when flaccid?

See in real life: Skin bumps can sometimes be diagnosed via video. A patient can try HealthTap PRIME for a virtual consult (there is a fee). Otherwise, one's primary care doctor or a dermatologist can examine the bump. It could be a closed comedone, a plugged sebaceous gland or follicle, an unusual mole, or less likely a wart. It may be best to get it examined, so that the doctor gets the texture and feel of it.