Conclusion
Bumps that are cancerous are mostly large, hard and painless. Most skin lumps are harmless, but any change in size or appearance should be reported to a doctor immediately.
References:
[1] https://www.healthline.com/health/keratin#:~:text=Keratin%20is%20the%20type%20of,hair%2C%20skin%2C%20and%20nails.&text=Keratin%20is%20a%20protective%20protein,an%20ingredient%20in%20hair%20cosmetics.
[2] https://medlineplus.gov/puberty.html#:~:text=Puberty%20is%20the%20time%20in,puberty%20is%20usually%20breast%20development.
[3] https://www.healthline.com/health/gardners-syndrome
[4] https://www.medicalnewstoday.com/articles/174229#:~:text=Insect%20bites%20are%20puncture%20wounds,pain%2C%20itching%2C%20and%20irritation.
[5] https://www.webmd.com/melanoma-skin-cancer/melanoma-guide/squamous-cell-carcinoma#:~:text=Squamous%20cell%20carcinoma%20(SCC)%20is,fairly%20slow%2Dgrowing%20skin%20cancer.
[6] https://www.webmd.com/pain-management/guide/joint-pain
[7] https://www.healthline.com/health/hernia#:~:text=A%20hernia%20occurs%20when%20an,upper%20thigh%20and%20groin%20areas.