I've had a protruding artery inside my left leg above the knee for several mths/yrs but now varicose veins too lower down. i keep very fit. any ideas?

Artery?: I am guess that you probably have a protruding vein. If it has a pulse and protrudes, you definitely want to see a vascular surgeon. On the other hand, it it is a vein (as I am guessing) then it is likely connected to your other varicose veins. A visit to a vein specialist (phlebologist) for a venous ultrasound evaluation can sort out the problem. From there treatment can be recommended.

See a vein doctor: This is normal for varicose veins - they are worse with standing. See a vein doctor and get them fixed. Phlebology.Org for a referral. Miamibeachvein.Com for more information. There is no such thing as a bulging artery. It is a vein.