Man I have freckles clustered all over my face...  they're melaninized cells and very noticable!
I have alot of freckles too. Ive always heard it was because I was Irish.
Yeah? People sometimes think they're moles, but thy are different than these and lentigines. 
Interesting. What are lentigines? Also what the difference between freckles and lentigines?
They are a small pigmented spot with a different pigment and a defined edge. They're harmless though!
I was told growing if you had alot of moles it was a sign you might have cancer. Is that true?
types, they are most common on skin tone 1 and 2, which usually belong to North Europeans. However, it can be found in all ethnicities.
Biology.
The formation of freckles is caused by exposure to sunlight. The exposure to UV-B radiation activates melanocytes to increase melanin production, which can cause freckles to become darker and more visible. This means that one may have never developed freckles before, but after extended exposure to sunlight, they may suddenly appear.
Freckles are predominantly found on the
Freckle
Freckles are clusters of concentrated melaninized cells which are most easily visible on people with a fair complexion. Freckles do not have an increased number of the melanin-producing cells, or melanocytes, but instead have melanocytes that overproduce melanin granules (melanosomes) changing the coloration of the outer skin cells (keratinocytes). As such, freckles are different from lentigines and moles, which are caused by accumulation of melanocytes in a small area.
Freckles can appear on all types of skin tones. Of the six Fitzpatrick skin