Take a clear photograph with a ruler beside the bump to document its size.
Note when it first appeared and how quickly it has grown.
Keep it clean and protect it from friction.
Do not squeeze it, cut it, or try to pull out the hard plug.
If it bleeds, apply steady pressure with clean gauze.
Seek urgent medical care sooner if there is spreading redness, increasing warmth or swelling, pus, fever, uncontrolled bleeding, or rapidly worsening pain.
A few details would help narrow this down
Could you tell me:
How old is your mom?
How long has the bump been there? Days, weeks, or months?
How big is it now? For example, pea-sized, pencil-eraser-sized, or around 1–2 cm?
Does it hurt, itch, or bleed?
Is the center a hard, dry, yellowish-white plug, or more like a dark scab?
If you can share a clear photo, I can help describe what the lesion resembles and what features are concerning—but a photo cannot reliably rule out skin cancer.
The main point is: keratoacanthoma is a plausible explanation, but squamous cell carcinoma needs to be excluded. Please don’t wait for the bump to disappear on its own.
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