My doctor recommended Retin-A as a treatment for Keratosis pilaris on my arms, under my chin and cheeks.It has really helped my cheeks and neck (virtually no bumps) but my arms still suffer from the 'lumps'. Do i need to use this indefinitely? If i stop will the condition come back on my face? I used to tan on sunbeds a lot as i felt the sun helped the condition so am now worried about sun damage to my skin - would Retin-A help this also? I use 0.025% gel. Should i be using gel or cream? Thanks