( ( ( Palms ( , ( ( soles and ) areas ) ) ) ( on ( the joints ) ) ) ( ( ( are often ) ( ( affected ( with ( ( hyperkeratosis , ) ( ( a thickening ) ( of ( ( the layer ) ( of ( dead ( skin cells ) ) ) ) ) ) ) ) ) ( on ( ( the surface ) ( of ( the skin ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Palms) (, ,) (NNS soles) (CC and) (NNS areas)) (PP (IN on) (NP (DT the) (NNS joints)))) (VP (VBP are) (ADVP (RB often)) (VP (VBN affected) (PP (IN with) (NP (NP (NNS hyperkeratosis)) (, ,) (NP (NP (DT a) (NN thickening)) (PP (IN of) (NP (NP (DT the) (NN layer)) (PP (IN of) (NP (JJ dead) (NN skin) (NNS cells)))))))) (PP (IN on) (NP (NP (DT the) (NN surface)) (PP (IN of) (NP (DT the) (NN skin))))))) (. .)))
Palms, soles and areas on the joints are often affected with hyperkeratosis, a thickening of the layer of dead skin cells on the surface of the skin.
(ROOT (S (NP (NP (DT The) (JJ thick) (NN skin)) (, ,) (VP (VBN found) (ADVP (RB only)) (PP (IN on) (NP (NP (NP (DT the) (NNS palms)) (PP (IN of) (NP (DT the) (NNS hands)))) (CC and) (NP (NP (DT the) (NNS soles)) (PP (IN of) (NP (DT the) (NNS feet))))))) (, ,)) (VP (VBZ has) (NP (DT an) (JJ extra) (NN layer))) (. .)))