Final answer:
A white lesion that does not rub off could indicate a serious oral condition and should be evaluated by a medical professional. Lesions with various colors and locations, as described, could be signs of skin cancer. Ringworm and bacterial infections also present with unique lesion characteristics that require medical attention.
Step-by-step explanation:
A physical or chemical injury leading to a white lesion that does not rub off may suggest oral pathology and necessitates medical attention. This could be indicative of conditions like leukoplakia, oral lichen planus, or other dermatological issues that affect mucous membranes.
When looking at different lesions, it's important to consider their appearance and response to environmental factors. A large brown spot on the skin with darker specks, a small lesion with an irregular border showing various colors, or a dark lesion in specific areas such as palms or soles are often signs of more serious conditions, possibly skin cancer, and warrant evaluation by a healthcare professional.
For example, as seen in the clinical scenarios, a lesion that fluoresces under a Wood's lamp may indicate an infection like ringworm, while a wound that becomes increasingly painful and swollen over time could suggest bacterial infection or abnormal healing.