[1] Choi, W., Yin, L., Smuda, C., Batzer, J., Hearing, V. J., & Kolbe, L. 2017. Molecular and histological characterization of age spots. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC5342934/
[2] Bährle-Rapp, Marina. "Altersflecken." Springer Lexikon Kosmetik und Körperpflege (2007): 25-25.
[3] Schulz, Hans. "Wie kommen die Flecken auf die Haut? Differenzialdiagnostik von Hyperpigmentierungen." MMW-Fortschritte der Medizin 148.10 (2006): 40-43.
[4] Mayo Clinic. Age spots (liver spots). 2025. URL: https://www.mayoclinic.org/diseases-conditions/age-spots/symptoms-causes/syc-20355859
[5] Passeron, T., Lim, H. W., Goh, C.-L., Kang, H. Y., Ly, F., Morita, A., Ocampo Candiani, J., Puig, S., Schalka, S., Wei, L., Dréno, B., & Krutmann, J. 2021. Photoprotection according to skin phototype and dermatoses: practical recommendations from an expert panel. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC8252523/
[6] Navarrete-Solís, J., Castanedo-Cázares, J. P., Torres-Álvarez, B., Oros-Ovalle, C., Fuentes-Ahumada, C., González, F. J., Martínez-Ramírez, J. D., & Moncada, B. 2011. A Double-Blind, Randomized Clinical Trial of Niacinamide 4% versus Hydroquinone 4% in the Treatment of Melasma. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC3142702/
[7] Sanadi, R. M., & Deshmukh, R. S. 2020. The effect of Vitamin C on melanin pigmentation – A systematic review. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC7802860/
[8] Eberlein-König, B., & Ring, J. 2005. Relevance of vitamins C and E in cutaneous photoprotection. URL: https://pubmed.ncbi.nlm.nih.gov/17134414/
[9] Sharad, J. 2013. Glycolic acid peel therapy – a current review. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC3875240/
[10] Callender, V. D., Baldwin, H., Cook-Bolden, F. E., Alexis, A. F., Gold, L. S., & Guenin, E. 2021. Effects of Topical Retinoids on Acne and Post-inflammatory Hyperpigmentation in Patients with Skin of Color: A Clinical Review and Implications for Practice. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC8776661/
[11] InfoMedizin. Mikrodermabrasion. URL: https://www.infomedizin.de/themenwelt/faltenbehandlung/behandlungen/microdermabrasion/
[12] Samargandy, S., Raggio, B.S. 2023. Chemical Peels for Skin Resurfacing. URL: https://www.ncbi.nlm.nih.gov/books/NBK547752/
[13] Jaiswal, S., & Jawade, S. 2024. Microneedling in Dermatology: A Comprehensive Review of Applications, Techniques, and Outcomes. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC11499218/
[14] Dermatologikum Hamburg. Pigmentflecken & Altersflecken entfernen. URL: https://www.dermatologikum.de/behandlungen/pigmentflecken-altersflecken-entfernen
[15] Puglia, C., Offerta, A., Saija, A., Trombetta, D., & Venera, C. 2014. Protective effect of red orange extract supplementation against UV-induced skin damages: photoaging and solar lentigines. URL: https://onlinelibrary.wiley.com/doi/10.1111/jocd.12083
[16] Mukherjee, S., Date, A., Patravale, V., Korting, H. C., Roeder, A., & Weindl, G. 2006. Retinoids in the treatment of skin aging: an overview of clinical efficacy and safety. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC2699641/