The glucocorticoid and ASA components are stated in several references not to be porphyrinogenic. Probably only insignificant systemic exposure.

Strong glucocorticoid, solution 2.5 mg/g, in combination with acetylsalicylic acid for scalp use. Glucocorticoid: South African list: use. Kalman, Bonkovsky: believed to be safe. The Merck Manual: use. Moore MR, Hift RJ: Drugs in acute porphyria. Cell Mol Biol 43:89, 1997: safe. Tschudy DP, Lamon JM: Porphyrin metabolism and the Porphyrias in Bondy BK, Rosenberg LE (eds): Duncan’s Diseases of Metabolism, Philadelphia, WB Saunders 1980, p 939: safe.. Acetylsalicylic acid: South African list: safe. Kalman, Bonkovsky: safe. Michael Moore’s list: safe. The Merck Manual: safe . Eales L: Porphyria and the dangerous lifethreatening drugs, S Afr Med 56:914, 1979: safe.