Cholasma is also known as Melasma – where small, irrigular dark patches (appearance of clusters of freckles) can appear anywhere on the body, most commonly on the face. It is caused by over stimulation of estogen and so Melasma/cholasma is more common in women – in pregnancy and from use of the contraceptive pill or hormone replacement therapy. Exposure to sun will promote the dark patches to appear more obiviously on the skin.
Often the discolouration will dissapear spontaneously over several months after pregnancy or ceasing use of contraceptives/HRT. Alternatively there are treatments available which would be best to ask your GP about. Also facial/chemical peel using glycolic acid would help fade the darken areas. Another option would be laser therapy – but this may be lenghtly and costly. A high sun factor should be used when exposure to sun and all year round especilly on the face.