I dreamed that seaweed grew on the upper limbs of the body, and the whole body secreted white oil without pain, and a lot of white oil could be scraped off the legs at once.

Seaweed, sexual desire.

Upper limbs, your own abilities and desires. Legs, sexual desire.

Algae grow on my upper limbs, and I crave sex.

White, my spiritual purity and wisdom.

Oil, purity and selfless dedication represent one's own reason.

White oil represents one's own reason and judgment.

The whole body secretes oil, which shows that your sexual desire has driven your reason out of your body. In other words, your body is monopolized by sexual desire, leaving your thoughts behind.