Moles Change for Reasons Other Than Skin Cancer
When you notice any changes in a mole, see a doctor immediately, as this could mean skin cancer. And you should, because ruling out skin cancer is very easy for doctors to do. Usually, a changing mole, or one that appears to have changed, is not skin cancer.
I'm telling you this so that when you notice a changing mole, you don't panic and think you'll die. However again, I stress, when a mole has changed, see a doctor as soon as possible, just to be safe. The procedure to determine skin cancer is so easy to perform, that there really is no excuse for skipping the doctor appointment. Changes in a mole have a variety of causes.
Irritated moles commonly change, they may get irritated from clothing, rubbing on waistbands, rubbing on surfboards, or rubbing on jewelry. These may get irritated and itchy and become red or crusted as a result. (A red or "crusting" mole can also be a sign of skin cancer.)
Keep in mind that, moles in areas like the axilla (underarms) may become irritated from rubbing/friction. Moles may become 'halo nevi' -- these are moles that develop a ring of light color around them. Although most are benign, these should always be evaluated to ensure they are not melanomas.
For people who are pregnant, moles may become darker or larger as a result of hormonal changes, or from stretching of the skin, due to growth or an enlarging abdomen. Typically good signs are when multiple moles are getting darker/bigger simultaneously rather than just one particular mole.
Do you have acne? People with acne may have moles that 'appear' to change, either from an underlying cyst or pimple that imparts a swelling or redness to the mole temporarily. This can be differentiated from a changing mole due to the relatively short time period of change.
Moles have a life span, and over a long period (years), they may simply change and evolve over time becoming smaller and lighter, and some actually seem to disappear.
Finally, mole changes caused by contact are also quite plausible, as certain chemical or caustic contact may impart irritation or redness to the area, making a mole look different.
All in all, be safe, and see a dermatologist about any changes that you have noticed.
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