Mal is the waste, a by-product of metabolism.
Purish – Solid Excreta
Mutra – Urine
Sweda – Sweat
The texts say that these mal gratify the body by leaving appropriately, very true! Ask the people having constipation or loose motion.
Also each Dhatu, while getting converted, leaves a mal respectively except Shukra, which is considered to be purest form of Dhatu.
Following Mala gets formed during the Dhatu conversion –
Rasa – Kapha (phlegm, saliva), abnormality causes colds
Rakta – Pitta(bile juice), abnormality causes acidity
Mans – Excretions of eyes, mouth, ear wax etc..
Meda – Sweat, abnormality causes bad smell
Asthi – Hair and nails , abnormality causes weak and brittle hair and nails
Majja- Eye secretions