Patient guide on freckle micropigmentation: permanent freckles safely. What it can and cannot achieve, indications, lentigines and photographic map, patch test with makeup, risks and questions to ask at consultation. INM Patient Guide no. 9. English version. Spanish version: DOI 10.5281/zenodo.23733055. Non-peer-reviewed preprint.
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Ramos et al. (2026) studied this question.
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