Coal tar is technically carcinogenic, yes, but no study has found any association with cancer when used topically in low doses [1].
Coal tar's mechanism of action is thought to be carbazole, an aryl hydrocarbon. It is assumed to work through binding to the aryl hydrocarbon receptor, a relatively newly discovered immune cell regulator. Tapinarof (Vtama) is a new medication that also works on ArH and is really effective at
reducing inflammation.
Coal tar was also used together with UVA light and psoralen (a light-sensitizing medication) to treat skin diseases like psoriasis, a protocol called Goeckerman therapy that's no longer commonly practiced. This combination does carry the risk of cancer, but it's probably due to the UVA and not the coal tar.
Coal tar is technically carcinogenic, yes, but no study has found any association with cancer when used topically in low doses [1].
Coal tar's mechanism of action is thought to be carbazole, an aryl hydrocarbon. It is assumed to work through binding to the aryl hydrocarbon receptor, a relatively newly discovered immune cell regulator. Tapinarof (Vtama) is a new medication that also works on ArH and is really effective at reducing inflammation.
Coal tar was also used together with UVA light and psoralen (a light-sensitizing medication) to treat skin diseases like psoriasis, a protocol called Goeckerman therapy that's no longer commonly practiced. This combination does carry the risk of cancer, but it's probably due to the UVA and not the coal tar.
[1] https://www.sciencedirect.com/science/article/pii/S0022202X1...