Becker nevus
https://en.wikipedia.org/wiki/Becker's_nevus
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Kei te tohuhia e te nevus nui me te tipu nui o ngā makau i runga i te rohe.

He wero pea te maimoatanga taiaho nā te kaha o te hyperpigmentation.
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References
Becker’s nevus - Case reports 35519166 NIH
Ko Becker nevus, e kiia ana ko Becker melanosis, he mātiro kiri pai. Ka puta mai i te whanautanga, ka tupu rānei i muri mai, ka puta he kiri mārō me te kore makawe. Kāore i te rerekē, ka pā te nuinga ki ngā tāne. He maha ngā wā ka pouri te wāhi kua pā ki te wā, ka tipu ngā makawe ki reira. He 29‑tau te pakeke o te turoro whakawhiti ira i tae mai, me ngā papa pouri i runga i tō ratau kiri i timata i te 15‑tau, he wāhi iti. I te wā o te tau, ka tipu ēnei wāhi ki ngā wāhi nui ake. I kitea i roto i te whakamātautauranga, he āhua pouri me ngā makawe kei te taha matau o te umu, te pakihiwi, te tuara, me te ringa o runga, he kotiti kē te taha.
Becker's nevus is also known as Becker melanosis. It is a benign lesion which can be presented as congenital or acquired with hairless or hypertrichotic lesions. It's a rare case which affects mainly male individuals. It is often pigmented and gets darker by time and excessive hair growth can be seen over it. A 29-year-old transgender patient presented with hyperpigmentation with the lesion which started at the age of 15 as a small hyperpigmented macule. The lesion increased gradually to form giant patches. On examination a right-side hyperpigmentation involving the anterior chest, shoulder, scapular region, upper arm with hypertrichosis and irregular margins.
Lasers for Becker’s Nevus 30762191 NIH
Ko te Becker's nevus he mate kiri noa e tohuhia ana e te papaki purakau me te tipu o ngā makawe ki tētahi taha o te tinana. He maha ngā wā ka tukuna ki ngā laser, ahakoa e noho ana ētahi atu whiringa. Ko ngā momo laser rerekē kua whakamahia, ko ia anake, ko te tahi rānei, me ngā roanga mai i te 504 ki te 10,600 nm me ngā wāhi mai i te 1 ki te 12. He rerekē ngā hua, engari ko te whakakotahi i ngā laser me ngā roanga rerekē he pai ake te mahi. Ko ngā paanga o te taha he ngawari, he whero ngawari. Ahakoa he pai te haumaru o ngā laser, he iti noa te whai huatanga (kāore i te pai) mō te Becker's nevus.
Becker's nevus is a common pigmented dermatosis, usually featured by ipsilateral pigmented patch with hypertrichosis. Becker's nevus is often treated with various types of lasers although other regimens are available. A variety of lasers had been used alone or in combination to treat Becker's nevus. Laser wavelengths used for Becker's nevus ranged from 504 to 10,600 nm, while the number of treatment varied from 1 to 12 sessions. The clinical outcomes were mixed although combination of lasers with different wavelengths appeared to achieve a better efficacy. Adverse effects were usually mild to moderate erythema. While lasers are relatively safe, their efficacy for Becker's nevus is moderate.
○ Māimoatanga
Ko ngā makawe e whakakikoruatia ana i runga i te nevus ka taea te tango mā te laser. Engari, nā te nui o te hokinga mai, ka tata te kore e taea te tango i ngā nevi me te laser.