Estrogen gel

Okay so I have a weird question (so perfect for reddit). I use the gel every night. I have a bath on an evening, don't shower in the morning. I do the gel after my bath, rub it onto my inner thighs, sleep all night, wear leggings the next day and find the gel is leaving marks on the inside of my leggings. Like 10 hours after application!! Is this because I'm not rubbing it in properly?

I only use one pump on each leg. But I'm petite and I don't feel like I have enough surface area to rub all the gel in (if anyone is hating me for this don't worry - my tummy is massive. My boobs and thighs small. I'm like the opposite of what a woman should aspire to :D )