I found a small bump on the left side of my foreskin when I took a shower, it didn't hurt or itch
There is no pain, no itch, no discomfort, no need to worry. The uploaded picture shows that it should be sebaceous gland displacement, which is caused by excessive sebaceous gland hyperplasia and has no effect on your health.
Avoid repeated scratching and squeezing stimulation, keep local cleanliness, prevent skin damage, infection and other conditions, if there is pain, itching and other conditions, the need for early hospital examination according to the condition of the drug or other treatment to relieve the symptoms, to prevent delay and aggravation of the symptoms of the situation.
The photos you uploaded are not very clear, so it is initially considered to be sebaceous ectopic disorder, mostly related to the abnormal development and hyperplasia of sebaceous glands.
The above suggestions are for reference only. You should eat less spicy and stimulating food, eat vegetables and fruits in moderation, and wash and dry your underwear frequently to maintain cleanliness and hygiene.