Answer
They contain the same active ingredients but differ in texture, excipients, application technique and licensed context. Gel is suited to the scalp, ointment is greasy, and foam is a flammable aerosol.
Sources for this answer
- Calcipotriol/Betamethasone 50 micrograms/g + 0.5 mg/g gel — Current selected SmPCemc · Summary of Product Characteristics
- Enstilar Cutaneous Foam — Current selected SmPC